HUWAEI Y536A1 unlock problem

Trying to unlock phone, I root it with v root successfully but when I click on unlock it says root first, I also found on forum that it is necessary to unlock bootloader first and when I click unlock bootloader it says "first root the phone"
very strange, If root and unlock bootloder method not working than why these options mentioned on supported moded page,
Kindly support and suggest me to unlock this phone